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I already own a certificate for a subdomain sub1.domain.com but I would like to secure all subdomains of domain.com buying a wildcard certificate. Can I still use the specific certificate for sub1.domain.com (so it works like an override of the wildcard certificate, like a wildcard DNS record) or I am required to install on that subdomain an instance of the new wildcard certificate?

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There is no reason you can not use both certificates.

However take note that a wildcard certificate is only valid for a single leaf (so something.example.com and not invalid.something.example.com)

the 2 certificates are completely independent of each other. It is even possible (although that would break CA guidelines) to issue multiple certificates for the same FQDN.

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